Android app with semi-basic mathematical operations

I am looking for an experienced Android developer to create an app with semi-advanced mathematical operations. Specifically, the application should perform polynomial division, as well as approximations of mixed trigonometric polynomials. Beyond that, the application should also have the capability to plot graphs of functions and should be user friendly. The design itself is open to the freelancer's ideas. The app shouldn't be too complex, one input box to write the equation, and empty space bellow where each step that the app is performing is to be displayed. I will be of help regarding the math required.